Self-measuring oil pump



Aug. 4, 1925. 1,548,120

. l.. A. DouRsoN sur lnsuama on. Puur- .Fned Aug. s, 1924 :sugars-sneu 1 Aug. 4, 1925.

| A. DoURsQN SELF MEASURING on. PUMP Filed Aug. 8, 1.924

Patented Aug. 4, 19.25.

`'UNITED STATESV 1,548,120 PATENTCFFICE.

LoUIs A; DoUnsoN, oF CINCINNATI, CHIC, AssIGNoRTo THEYAMERICAN CIIQPUMP & TANK Co., or CINCINNATI, CHIC, A CORPORATION 0F oHIo. v

SELF-MEASURING oIL PUMP.

Application filed August A8, Y1924,. Seral No. 730,851.

To all whom t may @0f/wem: v

u Be it known that I, Louis A. DoURsoN, a citizen of the United States, residing at Cincinnati, in the County yoi: Hamilton and State of Ohio, have invented new and useful Improvements in Self-Measuring Oil Pumps, of which the following is a speciiication. y My invention relates to measuring pumps adapted to be used to handle a great variety of liquids but which are particularly adapted to dispense lubricating oil. Garages and iilling. stations especially require such apparatus.

lThe principal'objeot of the invention is to provide a pumpwhose cylinder may be 'kept full of oil ready for immediate delivery, so constructed thatthe expansion of the oil Vvin the'cylinder will not cause the nozzlel to drip, and at the same timewill avoid* bursting the Cylinders'.` Another object of my invention is to provide a transparent measuring cylinder' withinV which the'piston is reciprocated in full view and subject to the inspection of purchasers at all'times.

Another objectv of my invention is to provide a simple, sturdy pump of pleasing appearance with a handle capable of being locked against'rotat'ion at any time." i 'Y My invention is illustrated in the accompanying drawings' in which:

Figure 1 is aperspective of the pump mounted in positi'onffor use on an oil tank;

Fig. 2, an enlarged detail, is an axial section through the combined top cylinder head and nozzle;

Fig'. 3, a detail, is an enlarged perspectivel of the nozzle valve; and Y y Fig. 4: is an enlarged axial section thru the pump heads, cylinder and piston, showing the rack and driving piston at its extreme high position.

Referring now to the drawings :-`1is an oiltank with till cap 2. A pump base Sis mounted upon said tank andraises thepump to a convenient height for use. Aboss 4 'on'the side of the lbase is 'pierced to permit.

a locking rod 5 to beypassed thru yit and I the size ofthe opening that air will not go a hole in the pump handle l7.

" Surmounti'ng the base 1s the lower cyl-l inder head 8 which acts also asa casingftor the` gear 9 fixed to theshaft- 10 which is rotatedby the handle 7 thru stutiing-box 10a. Gear 9 is constantly-inlinesh' withthe gear, with the rack lland the rack and gear are held inl mesh by the flanged roller 12.

To the bottom of 8 is secured the usual Vsupply pipe 13 which extends substantially to the bottom of the tank 1 and is provided with any convenient form of strainer 35. A glass cylinder 14 is suitably mounted between the bottom cylinder head 8 and the top cylinder head 15, and tie rods 16 hold the parts securely in position.

, To theV top of the rack 11 is rigidly secured a piston'consisting of a lower cage 17 having an axial valve rod 20, rigidly secured thereto and a valve sea-t 18upon which seats a poppet valve 19. lThe poppet valve is bored axially at 22, a t-riiie large so as to .make a very easy lit onv the valve rod 20 and permits oil in the top cylinder vhead and glass Cylinder when expanded byfheat to'seep back downwardly thru the clearance space between the valve rod and poppet valve suiiiciently `to ease they pressure but not enough to attect the measure substantiallyL kThe movement of the valve 19 on the valve rod 20 is a wiping action which maintains the minute clearanceY ring between them. A top cage 21 holds the valve in position.` The usual cup leather 23 and its sustaining lspring QSa'are provided. A screw 24 threaded axially thru'the top cylinder head 15 extends downwardly so as tollimit "the upward movement ct they piston vand when'regulated is held in position by the lock nut'Q `which is the bott-om part of a cap which sustains an` advertising sign 26.

V'A lug 38 on the bottom cylinder head 8,

limi-ts the downward movement of the piston. On one side of the top cylinder head and integral with it is'formed a nozzle casing 27 with oil passage 28, thru which the flow of oil from the interior 29 of the main, body of the top cylinder head is controlled by the poppet valve 30, having up into the nozzle and permit the oil lto ydrip out. Acap l37 closes Vthe opening in the top of the nozzle casing. p Y

A 4stand-36 is providedjto support any receptacle used to catch vthey oilas is n guide ribs 31,V y"adapted to be guided by the hole 82.l A

The poppet valve 30 rises iromits seat duringthe: upstroke of the piston and on the Adowiistroke is seated preventing .air from reaching the,top ot' vthe .liquid in the pump, atmospheric pressure on the body of oil in .the tank keeping the pump full oi'V oil, and the poppet -valve 19 in the piston opens on the return stroke or the pisto1i,allowing oil,to flow up .thru the cage Hand-past `.the valve 19 of the piston and lill the space in ,the cylinder above the piston.- As 1soou as the piston ceases to move downwardly tliewaive v19 closes enabling the pump ,to deliver the measured quantity oflo'il on .theup-stroke ofthe piston. rlhere is Yno check valve below the piston for the` purpose ofholding the liquid in the pump, ithe poppet'` valve 30 performing the function of .the check valve usually' placed below the ipiston. It will he evidentthatfas longasthe lower end of the pipe 13 is belowthe level of the liquid inthe tank-1 andthe poppet valve 30 is closed, no liquid can drain back. from any part of 1the pump or suction pipe into the tank, other thanthatlue to It-helexpansion ofthe oil in ,the ,pump and suction line.

It has been oundthat when the oil be- Vtween .the piston andthenozzleoi a pump'as lusually constructed gets warmer and expands the excess volume created `is discharged A lfrom Y the nozzle, causing dripping .and consequently an unsightly appearance of the device. Furthermore, when the re- `maining oil gets cooler and contracts, the

diilierence` in volume causes air to enter the `pump through the nozzle and to ill the space previouslyoccupied vby the oil. On the next operationoi' the pump, this air causes-the oil ,to sputter and spray lover the pump and/operator, and also causes the pump ,to give shortineasure.

In my invention when expansion takes piace, the excess oil between the piston and fthe nozzle does not go through the nozzle andcause dripping, but passes :through the rsmall,clearance space between the poppet valve .319 and the valve rod 20, then through the cage 17, thelower part of the cylinder le, the .,interio-rof lower cylinder head 8 and supply` pipe 13. When the oil cools and contracts, oil rises in the pipe 13 to cylinder head 8, 'lower part of cylinder 14, up thruA passage between 19 and 20, into the upper part of cylinder 14, keeping the cylinder` full 01"' oil at all times. The oil in the part of pump below the piston can expand freely into the `reservoir or tank 1, sincethere is no check vave intervening. Contraction of oil in same part is compensated for by oil passing from the tank ,into and lthroughthe suction pipe. i

I claim as my invention and desire to secure by Letters Patent of the United States; Y

l. A self measuring oil pump having in combination a pump cylinder, a discharge nozzle in Efluid connection with saidcylinder, a check valve in connection with said nozzle, reciproca-ting piston within said cylinder and means ifor allowing minute quantities oi oil' under pressure toseepgback from the discharge side of said pisiton to the supply side. i

2. A self measuring oil pump havin-g in combination a pump cylinder, ahdischarge nozzle in tluidconnectioii withltlie.,`top of said cylinder, a 'check' valve infconne'ction with said nozzle, a reciprocating piston within said cylinder and means for allowing minute quantities of. oil under pressure to seep ack from Athe discharge sideo V.said piston to the supply side.,f l l l y 3. A self measuring oil pumpghaving lin combination a-pump cylinder, a top cylinder head, a discharge nozzle in fluid connection with said top` cylinder head, a. check'valve in connection with nozzle, areciprocat- ,ing piston within said cylinder land means tor allowing` minute l,quantities oioil under pressure to 'seep back from lthe upper to the ,100

under.sideofsaidfpiston. n Y ,4. Aself measuring oil pump yhavingin combination a ypumpfy cylinder, a top cylinder headin connection with a discharge llQZZle, said nozzle, ,la valve withiny said nozzle, a reciprocatingppiston within said cylv inder and means ,for allowing-l minute quantities Tof oil under pressure to seepv back from theupperto the under side V"of said pist-0n.

5. A self measuring oil puniphaving in `combination pump cylinder, a discharge nozzle in fluid Connection,withsaid cylinder, a check; valve in connection with. said nozzle, a .nondrip tip for said Ydischarge, nozzle, reciprocating piston within said cylinden and Yinl'eanfs for allowing minute .quantities of oill `under pressure to seep back from the dischargev sileofsaid piston vto Ethe l,supply side.

46. A selfy measuringoil pump Vhaving Yin combination a y pumppcylinder, a l discharge nozzle. in fluid connection. with the top'ot saidcylinder, a check valvedn vconnection withsaid nozzle, a nondrip tip for said'dis,

chargenozzle,l areciprocating Apiston within `said-,cylinder and lmeans i'oiallowing lminute quantitiesofoil under pressure to ,seepV backfrom ythe discharge side of saidlpiston Y to the supply side.

7. A self measuring oil pump having in head, a discharge nozzle combination a pump cylinder, a top cylinder in fluid connection with said top cylinder head, a check. valve in connection with said nozzle, a nondrip tip for said discharge nozzle, a reciprocating piston within said cylinder and means for allowing minute quantities of oil under f pressure to seep back from the upper to the under side of said piston. f

8. A self measuring oil pump having in combination apump cylinder, a top cylinder head in connection with la discharge nozzle, said nozzle, a valve within said nozzle, a nondrip tip for said discharge nozzle,

' areciprocating piston within said cylinder and means for allowing minute quantities of oil under pressure to seep back from the upper to the under side of said piston.

9. A self measuring oil pump having in F combination a pump cylinder, a combined top cylinder head and discharge nozzle, a valve allowing oil to flow thru said nozzle but closing it against ,return therethru, aL

reciprocating piston within said cylinder, an axially bored poppet valve in said piston and a fixed valve stem for said poppet valve, the difference in diameter between said stem and the'bore of said poppet valve being such as to allow minute quantities of oil under pressure to seep backfrom the upper to the under side of said piston.

10. A self measuring 011 pump having in combination a pump cylinder, a discharge nozzle in lfuid connection with said cylinder, a reciprocating pistonv within said cylinder, means for allowing minute quantities of oil under pressure to seep back, from theA discharge side of said piston to the supply side, a valve means between said cylinder and said discharge nozzle to prevent break in vacuum when said piston is on the downstroke. l l

In testimony whereof I have hereunto set my hand.

LOUIS A. DOURSON. 

